Determination of Au in Deep-penetrating Geochemical Samples of the Wangjiaping Gold Deposit by ICP-MS with Extraction Elements of Mobile Forms
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摘要:
金属活动态测量方法是寻找隐伏矿的有效手段之一，但在方法应用过程中发现不同地球化学景观条件下金元素的有效活动态类型不尽相同，并且提取过程中固液比、温度、时间等条件会对活动态提取数据产生较大影响。为了探讨金元素活动态选择性提取及方法在秦岭地区的指示效果等问题，本文利用电感耦合等离子体质谱（ICP-MS）分析技术对秦岭地区王家坪金矿床金元素活动态提取的不同实验条件及不同粒级样品进行对比研究，确定了针对金元素水提取态、黏土吸附态、有机结合态和铁锰氧化物结合态的最佳提取条件为：固液比1：5，提取时间24h，提取温度35℃，采样粒级为-80目。金元素四个相态的方法检出限分别为：水提取态0.03ng/g，黏土吸附态0.03ng/g，有机结合态0.04ng/g，铁锰氧化物结合态0.05ng/g，精密度（RSD）为7.25%~9.02%。该方法应用于王家坪金矿床23线，经分析金元素各形态平均含量为：水提取态0.19×10-9，黏土吸附态0.30×10-9，有机结合态11.16×10-9，铁锰氧化物结合态0.20×10-9，其中有机结合态为矿区土壤中金元素赋存的主要活动相态，金的有机结合态异常与隐伏金矿体位置一致。
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关键词:
- 王家坪金矿床 /
- 活动态提取 /
- 电感耦合等离子体质谱法 /
- 深穿透地球化学 /
- 隐伏金矿体
Abstract:BACKGROUND Metal activity state measurement method is one of the effective means to find hidden ore. However, during the application of the method, it was found that the types of effective activity states of gold in different geochemical landscape conditions were not the same. Moreover, it was found that the conditions such as solid-liquid ratio, temperature and time during the extraction would have a significant impact on the active state extraction data.
OBJECTIVES To solve the problems of selective extraction and accurate determination of the active state of gold.
METHODS A comparative study of different experimental conditions and samples of different grain sizes for the active state extraction of gold from the Wangjiaping gold deposit in the Qinling area using ICP-MS analysis.
RESULTS The optimal extraction conditions for gold element water extraction state, clay adsorption state, organic binding state and iron manganese oxide state were determined. Solid-liquid ratio was 1:5, the extraction time was 24h, the extraction temperature was 35℃ and the sample size range was -80 mesh. The method detection limits for the four phase states of elemental gold were 0.03ng/g for water extraction state 0.03ng/g for clay adsorption state, 0.04ng/g for organic binding state, 0.05ng/g for iron manganese oxide state. The relative standard deviation (RSD) was 7.25%-9.02%. In the 23rd line of the Wangjiaping gold deposit, the average content of the water extracted state gold was 0.19×10-9, the average clay adsorption state gold was 0.30×10-9, the average organic binding state gold was 11.16×10-9, and the average iron manganese oxide state gold was 0.20×10-9.
CONCLUSIONS The organic binding state is the main active phase state of gold in the soil of the mining area, and the abnormality of the organic binding state of gold is consistent with the position of the hidden gold ore body.
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表 1 方法精密度
Table 1. Precision tests of the method
活动态实验标准样品 参数 水提取态 黏土吸附态 有机结合态 铁锰氧化物结合态 金含量测定值(×10-9) 0.01 0.02 1.46 0.02 GBW07246 标准偏差(×10-9) 0.085 0.151 0.108 0.145 RSD(%) 8.52 7.52 7.38 7.25 金含量测定值(×10-9) 0.01 0.02 2.54 0.02 GBW07247 标准偏差(×10-9) 0.090 0.171 0.221 0.152 RSD(%) 9.02 8.56 8.68 7.62 
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表 2 方法准确度
Table 2. Accuracy tests of the method
活动态实验标准样品 金含量标准值
(×10-9)金含量测定值(×10-9) 相对误差
(%)水提取态 黏土吸附态 有机结合态 铁锰氧化物结合态 残渣 合计 GBW07246 20.8 0.01 0.02 1.46 0.02 18.1 19.6 5.77 GBW07247 50.0 0.01 0.02 2.54 0.03 48.8 51.4 2.80
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